Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quem é o artista original da música "Rhiannon"?
 ###Tabelas: CREATE TABLE east_german_championship (east_german_championship_id AUTO_INCREMENT PRIMARY KEY, Race Name VARCHAR, Circuit VARCHAR, Date VARCHAR, Winning driver VARCHAR, Constructor VARCHAR, Report VARCHAR) CREATE TABLE performances_results (performances_results_id AUTO_INCREMENT PRIMARY KEY, Week # VARCHAR, Theme VARCHAR, Song choice VARCHAR, Original artist VARCHAR, Order # VARCHAR, Result VARCHAR) CREATE TABLE best-selling_albums (best-selling_albums_id AUTO_INCREMENT PRIMARY KEY, No. INT, Album VARCHAR, Artist VARCHAR, Record label VARCHAR, Released VARCHAR, Chart peak INT, Number of times certified platinum VARCHAR) CREATE TABLE pdc_premier_event_finals:_5_1_title_4_runner-ups (pdc_premier_event_finals:_5_1_title_4_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Opponent in the final VARCHAR, Score (l) = score in legs, (s) = score in sets. VARCHAR) CREATE TABLE 1934_ladder (1934_ladder_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Wins INT, Losses INT, Draws INT, Against INT)  
SELECT Original artist FROM performances_results WHERE Song choice = " Rhiannon "